I recently upgraded my heads to GT40X heads installed a E Cam I had on the shelf for a few year. Other previously installed upgrades have been Explorer intake 24/hr injectors 76 MM C&L MAF, 70MM TB and EGR delete.

Once it was back together it was idling really low and was stalling. I got it to run enough to bring it to a local shops dyno day. The AFR stayed @16:1 which is way too lean. I was advised to raise the fuel pressure from 40PSI to @55psi the car seemed to idle smoother but pressure dropped off again, so I replaced my fuel pump figuring the pump is failing to maintain pressure. Now the fuel pressure was @85psi when I started it. It does seem to have a vacuum leak now too, which I cannot fix at the moment due to recent surgery.

I'm wondering if my 24/hr injectors are not enough for the current upgrades and considering going up to 30's.